Brake for talking-machines.



G. P. WILD.

BRAKE POR TALKING MACHINES.

APPLICATION rum) H2111, 1912.

1,072,066. Patented sept. 2,1913.

2 SHBIZTB-BHEET 1.

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WITNESSES /Qw- ./0 y r. 9% @3 f5 BY PVD Rl lunntlu G. P. WILD. BRAKE ron TALKING MACHINES. APPLIOATIDE FILED PEB. 1, 1912.

1,07g066- Patent-.ed sept.2,1913. 2 SHEETS-SHEET 2.

BY W

eNTnEa Enzian WILD, or PHILADELPHIA, PENNSYLVANIA.

miami Foa matanNetariierurms.'i

spmun-or Letters haar. d Patented Scpt.2, 1913.

" Application med February 1, 1912. Serial No. 674,764.

To all 'whom it may concern:

Be it known that I, GNTHER PHILIP' WILD, a citizen of the United States, residing in the city .and county of- Philadelphisn,

State of Pennsylvania, have .invented a new and useful Brake for Talking-Machines, of

Whiclrthe following is a specification.

My invention consists of improvements on the brake attachment Afor talking machines` for which Letters Patent N o. 1,001,171 were issued to Frederick W. Schmidt on August 22nd, 1911.

It. further consists of an improved construction of the brake-mechanism in such attachment.

It further consists of other novel features of construction, all as will be hereinafter fully set forth.`

description set forth in detail one mechanical form embodying the inventlon, such detail construction ,being but one f various' mechanical. forms in which the principle of the invention may be used. f

In said annexed drawings-Figure 1 represents a top plan view, somewhat dia grammatic, of a talking machine provided with my improvement. F ig.`2 represents a section of the finder-bar and its support. Fig. 3 represents a detail plan View of the end of the blank from which theiinder-bar is formed. Fig. 4 represents a vertical section of the brake. Fig. 5 represents a horizontal section of the brake and a detail plan View of the associated parts of the brake device with thebrake withdrawn. F igfG represents a similar view with the brake set.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings, the reference numeral 1 indicates the casing or cabinet of the talking machine, upon which. the recordcarrier or turntable,'2, yis rotatably mounted to carry the record, 3. The machine has the usual tapering tone-arm or tone-tube, 4, at the free outer end of which is the soundbox, 5. All of -said elements are of the usual or any approved construction employed in talking machines.

A hollow post, 6, is secured upon the top of the cabinet, like in the above-recited patent, and a split plug, 7, fits in the same `and has a shouldered head, 8, into which is threaded a clamping-screw, 9, which clamps the longitudinally slotted finder-bar, 10, all

as in theabove patent. .In the present instance, the finder-bar is curved land has van openlng, 11, at its outer free end. A spring, 12, 1s secured tothe upper side ofthe bar and carries at its outer free end a needle, 13, .which registers with and may pass through the opening in the end of the bar. A linger-piece, 14, is secured upon the outer end of the spring Vto a'ord a proper hold for the finger to depress the finder-needle. A lug, 15, is formedl integral with the finderbarand is bent upward, and a contactsscrew, 16, is threaded through siich lug. The distance between the needle and the point'of the contact-screw is the same as thatbetween the stylus of the sound-box and the point where the latter will contact with the contact-screw, when the tone-arm is brought The annexed drawlngs and the followlng' plate, and screws, 22, pass through metallic washers, 23, insulating washers, 24, and the openings in the base-plate, into the insulating plate and the casing, thus-securing the latter upon the base-plate. A bolt, 25, slides within the casing,`and a Spring, 2G, within the casing bears against the rear end of said bolt. A brakeplug, 2T, of leather ori similar material, is secured in the end of the bolt to healagainst and exert braking friction against the turntable when the bolt is pushed outward by the spring. A knob, 2S, is 'screwed into the bolt and slides in a slot, 29,-in the casing, and the bolt may be manipulated by saidknob. A tooth, 30, projects from the side of the bolt and slides in a slot, 31, in the casing, and said tooth may bc engaged by a detent, 32, upon an armature, 33, of two electro-magnets, 34. The armature is formed with ears, 35, bent away from the bodyjof the same and mounted on` a post,"36, around which is wound a spring, 37, normally tending to forcethe armature away from the magnets battery-circuit is connected to the tone-arm.

When the slotted finder-bar is adjusted to the machine, which, like in the device of the above-mentioned patented structure, is only .necessary when the attachment is adjusted to the machine, and 4a record is placed on the turn-table, the needle is brought into regis? ter with the last groove of the record and is turntable, the needle is brought into regisof the needle registers with the inner end of suchgroove. lVhen the pressure upon thel finger piece is relieved, the needle is withdrawn by the spring, and the talking-machine maybe startedby pulling the brakebolt back by means of its knob,'until the tooth of the bolt is engaged by the detent of the armature. When the stylus of the sound-box arrives at the end of the groove in the record, the tone-arm contacts with the contact-screw upon the finder-bar, closing the circuit and energizing the electro-magnet, which causes the armature to be withdrawn from engagement with the tooth upon thel brake-bolt, allowing the spring of the latter to force it into contact with the' turntable, stopping the latter. When" the armature is withdrawn from engagement with th e. @tooth,npon the bolt, the current, which has been passed through` the bolt and armature while the tooth and detent were in engagement, is broken, and the armature flies back against its stop. A slight arc is liable to be formed when the circuit is broken by withdrawing the armature from engagement with the tooth or contact-piece of the brake-bolt, between said tooth and the detent upon the armature, which gradually oXidizes the contact points of said parts and produces bad contact or eventually. entirely destroys the same. By constructing the armature with the projecting detent which is directly in the path of the tooth upon the brake-bolt when the armature is released from the magnets, the tooth and detent will exert a wiping action upon each other, so

` that any oxidized lm which may have been formed upon the contact points of said elements will be removed each time jthe brake is set.

By carrying the circuit through Ithe brakebolt and armature, a simple and direct contact is made and the mechanism is exceedingly simple, inexpensive of manufacture and not liable to get out of order.

Other modes of applying the principle of my invention may be employed for the mode herein explained. Change maytherefore be made as regards the mechanism thus disclosed, provided the principles of construction set forth, respectively, in the follow- .ing claims are employed.

Having thus described my invention, what IY claim as new and desire to secure by Lettersi'Patent, is 1. In a braking attachment for talking machines, a rotatable member, a spring-actuated brake-bolt adapted for engagement with said member, an electro-magnet having one terminal of its winding in constant electrical connection with said bolt, an armature formed with'a detent adapted to engage and form direct electrical contact when in released position with said brake-bolt, a spring connected to move said armature away from said magnet, an electric circuit constantly connected to said armature and to the other terminal of the magnet-winding, and means for positively opening and closing said circuit.

2. In a braking attachment for talking machines, a rotatable member, an insulated casing, a spring-actuated brake-bolt, adapted for engagement with said member, sliding within and in constant electrical contact with said casing, means for retracti'ng said bolt, an electro-magnet having one terminal of its winding in constant contact with said casing, an armature formed with a detent projecting tol engage and form direct electrical contact when in released position with the brake-bolt, a spring connected to move said armature away from said magnet, an electric circuit constantly connected to such armature and to the other terminal of'the opening and closing said circuit.

3. In a brake for talking machines, a rotatable member, an electric circuit, positively actuated means for closing and opening said circuit, a brake bolt constantly connected in said circuit and having means for automatically throwing it into engagement with said 4member and for positively retracting it, an

armature constantly connected in said circuit and having detent means for engaging when in released position the retracted brake-bolt and for thus making direct electrical contact with the same, and means for automatically moving said armature into released position.

GNTHER PHILiP WILD.

Witnesses:

JOHN Donss, D. C. DRAPER.

electro-magnet, and means for positively 1 

